YOU SAID:

I mean, you're only my Stepbrother

INTO JAPANESE

つまり、あなたは私の義理の兄弟だけです

BACK INTO ENGLISH

That is, you are only my brother-in-law

INTO JAPANESE

つまり、あなたは私の義理の兄弟だけです

BACK INTO ENGLISH

That is, you are only my brother-in-law